Still from American Sniper. The comic is never named, but if you look closely, you can see that it's issue No. 1 of the sixth volume of Punisher, released in January of 2004 (making it very believable as something Biggles could be reading during the platoon's 2004 deployment).
A Dr. Garry Choy, MD, Diagnostic Radiology, answered. Radiation fibrosis is the result of prior radiation exposure that results in scarring of an organ such as breasts, lungs, etc. Post radiation treatment fibrosis is the typical cause.
For pain that is caused by lung cancer or by the spread of cancer to other parts of the body, radiation therapy can be used palliatively, to shrink tumors and help reduce discomfort. Surgery. In some cases, surgery to remove part or all of a tumor can be used to relieve pain.